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CSS Base

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Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

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Code Indentation


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Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

              <div class="mask"></div>

<ul class="img-list">
  <li><a href=""><img src="https://images.unsplash.com/photo-1467189386127-c4e5e31ee213?dpr=1&auto=format&fit=crop&w=767&h=511&q=80&cs=tinysrgb&crop=" alt=""></a></li>
  <li><a href=""><img src="https://images.unsplash.com/photo-1463569643904-4fbae71ed917?dpr=1&auto=format&fit=crop&w=767&h=511&q=80&cs=tinysrgb&crop=" alt=""></a></li>
  <li><a href=""><img src="https://images.unsplash.com/photo-1460891053196-b9d4d9483d9b?dpr=1&auto=format&fit=crop&w=767&h=495&q=80&cs=tinysrgb&crop=" alt=""></a></li>
  <li><a href=""><img src="https://images.unsplash.com/uploads/141219200475673afcb68/f5bd8360?dpr=1&auto=format&fit=crop&w=767&h=511&q=80&cs=tinysrgb&crop=" alt=""></a></li>
  margin: 0
  padding: 0
  box-sizing: border-box

html, body
  height: 100%

  text-align: center
    width: 250px
    display: inline-block
    list-style-type: none
      width: 100%

  display: none
  position: fixed
  top: 0
  width: 100%
  height: 100%
  background: rgba(0,0,0,0.8)

    width: 100%
    max-width: 650px
    padding: 10px
    background: #fff
    position: relative
    top: 50%
    left: 50%
    transform: translate(-50%, -50%)
      width: 100%
      color: #000
      background: rgba(255,255,255,0.8)
      width: 30px
      height: 30px
      text-align: center
      line-height: 30px
      position: absolute
      top: -35px
      right: -35px
        size: 24px
        weight: bold
      border-radius: 50%
      cursor: pointer
        background: rgba(255,255,255,1)

  display: block !important

// Animation
  animation: fadein 400ms ease-in-out

@keyframes fadein
    opacity: 0
    opacity: 1

  animation: fadeout 400ms ease-in-out

@keyframes fadeout
    opacity: 1
    opacity: 0

  $('.img-list a').on('click', function(e){

    var imgLink = $(this).children('img').attr('src');

    $('.mask').html('<div class="img-box"><img src="'+ imgLink +'"><a class="close">&times;</a>');

    $('.mask').addClass('is-visible fadein').on('animationend', function(){
      $(this).removeClass('fadein is-visible').addClass('is-visible');

    $('.close').on('click', function(){
      $(this).parents('.mask').addClass('fadeout').on('animationend', function(){
        $(this).removeClass('fadeout is-visible')


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